(a) Ductile Iron Pipe for Gravity Sewer and Force Main.
(1) General.
a. Ductile Iron Pipe (DIP) shall meet the requirements of AWWA C-151 and as required herein.
b. Ductile Iron Sewer Pipe must be easily recognized by brownish red bells and spigots, as well as, exterior stenciling of the words "For Sewer Only".
(2) Thickness class.
a. Pipe thickness class shall be determined by pipe diameter, system working pressure and anticipated laying conditions. In general, for a 12-inch or less diameter pipe with a burial depth of 15 feet or less in a Type 2 laying condition, the pipe pressure class will be Class 350.
(3) Pipe lining.
a. When used in sanitary sewer applications, ductile iron pipe and fittings shall be lined with 40 mils of Protecto 401 Ceramic Epoxy liner or equal. All bells and spigots shall be lined with a minimum of 8 mils of Protecto 401 or approved equal.
b. The liner shall meet the manufacturer's recommendations.
(4) Joints.
a. Ductile iron pipe for below ground service shall have push-on or mechanical joints, unless otherwise required by the city and shall conform to AWWA C151.
b. Ductile iron pipe for above ground service shall have flanged joints unless otherwise required by the city and shall conform to AWWA C115.
c. Ductile iron pipe on piers shall have rigid restrained joints as recommended by the pipe manufacturer.
(5) Restrained joints.
a. Provide restrained joint pipe at fittings and valves as calculated by the design engineer and approved by the city. Restrained joints shall be Snap-Lok (Griffin Pipe), Flex Ring and Lok-Ring (American), TR Flex (U.S. Pipe) or approved equal.
b. Restrained joint pipe and fittings shall meet all AWWA standards and other requirements as specified above for standard ductile iron pipe and fittings unless addressed herein.
c. Field made joints are allowable but should be avoided where possible. Careful planning to locate field cuts in standard pipe sections is preferred. For field made joints in restrained piping, use field weldments or an insert equal to TR Flex Gripper Rings or approved equal. Gasket type field made joints will not be allowed.
d. Restrained joint fittings shall be provided by the restrained joint pipe supplier where located within restrained joint pipe sections. Fittings shall be of the same model and type as the pipe supplied from the pipe manufacturer.
e. Restrained joint fittings may be push-on joint type.
f. Megalugs, Series 1100, as manufactured by EBAA Iron Sales or approved equal shall be allowable for restraint where approved by the city.
g. Contractor shall develop a field layout schedule and drawing for restrained joint pipe installations.
(6) Fittings.
a. Fittings shall be made of ductile iron and shall conform to AWWA C110 or C150.
b. Fittings to be lined with 40 mils of Protecto 401 Ceramic Epoxy or equal.
(b) Polyvinyl Chloride (PVC) Pipe for Sewer Force Main.
(1) General.
a. All PVC pipe shall be manufactured in accordance with AWWA C900.
(2) Pressure class.
a. Pressure class for the pipe will be dependant on system working pressure but will be a minimum of Class 150 with a standard dimension ratio of DR 18.
(3) Joints.
a. Pipe shall have plain end and elastomeric-gasket bell ends.
(4) Fittings.
a. Fittings shall be made of ductile iron and shall conform to AWWA C110 or C150.
b. Fittings to be lined with 40 mils of Protecto 401 Ceramic Epoxy or equal.
(c) Polyvinyl Chloride (PVC) Pipe for Gravity Sewer.
(1) General.
a. All PVC sewer pipe four inches through 15 inches in diameter shall have a minimum standard dimension ratio (SDR) of 35 and shall meet all requirements of ASTM Specification D3034.
b. For depths greater than 20 feet, all PVC sewer pipe four inches through 15 inches in diameter shall have a minimum standard dimension ratio (SDR) of 26.
c. Nominal pipe length shall be a minimum of 13 feet.
(2) Joints.
a. Pipe shall have an integral elastomeric-gasket bell end.
b. Gaskets shall be in conformance with ASTM F477.
(d) Services.
(1) General.
a. Unless otherwise directed by the city, pipe for gravity sewer service laterals, including the cleanout stack, shall be PVC Schedule 40 pipe meeting the requirements of ASTM D1785, or ductile iron pipe.
b. All service connections to new lines shall be made by installing "wyes".
(2) Joints.
a. Joints for PVC service pipe shall be solvent cement welded.
(e) Encasement pipe.
(1) Materials.
a. Encasement pipe installed under city maintained and NCDOT maintained roadways shall be in accordance with NCDOT's “Policies and Procedures for Accommodating Utilities on Highway Rights-of-Way”.
b. Encasement pipe installed under railroads shall be in accordance with “Part 5.3, Specifications for Pipelines Conveying Non-Flammable Substances” as developed by the American Railway Engineering Association (AREA).
c. Pipe materials used for the carrier pipe shall be adjusted as needed to meet the requirements of the roadway or railroad owners.
d. Pipe supports used in the encasement pipe designed and manufactured for the support of the carrier pipe shall be as follows:
1. Band and riser material. 14-gauge steel for band and riser except if the riser is over 6 inches high, the steel shall be 10-gauge for riser. Riser shall be of the channel shape. Band with risers shall have a fusion bonded PVC coating of a minimum of 10-mil thickness. Band shall be bolted together with stainless steel bolts, nuts and washers.
2. Band liner. Provide PVC liner a minimum of 0.09 inches.
3. Runners. Glass reinforced polyester of UHMW polymer plastic. Runner shall be a minimum of 1 inch wide and not more than 1 inch shorter than the bandwidth. Provide 2 top and 2 bottom runners for pipe sizes through 12 inches and 2 top and 4 bottom runners for pipes over 12 inches.
e. End seals installed on the encasement pipe may be a wrap around or a pull-on type. Seal shall be made of 1/8-inch thick synthetic rubber and shall be secured with stainless steel banding straps with worm gear tightening device. Alternate means of sealing the encasement may be approved by the city.
(Ord. of 11-7-16, No. 10-16)